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Integrated real-time production scheduling of a multiple cryogenic air separation unit and compressor plant

Lookup NU author(s): Richard Adamson, Dr Mark Willis



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


The development and application of an integrated real-time production scheduling and control strategy for a multiple cryogenic air separation unit (ASU) and compressor plant is discussed. Using a top-down optimisation approach, the operational targets for ASU production and compressor configuration are obtained for a given customer demand and subsequently managed using a real-time optimisation strategy. This is integrated with existing control to implement the steady-state configuration targets subject to process disturbances, power price fluctuations and against network change penalty weightings. Network material balance and network component operating constraints are met while simultaneously minimising plant reconfiguration costs during transient operation which occurs as a result of changing demands. Implemented using mixed integer linear programming, it is demonstrated that the two-stage optimisation strategy improves site operating costs by an average of 5% over the considered trial period (which would translate into substantial cost savings for such an energy intensive process).

Publication metadata

Author(s): Adamson R, Hobbs M, Silcock A, Willis MJ

Publication type: Article

Publication status: Published

Journal: Computers and Chemical Engineering

Year: 2017

Volume: 104

Pages: 25-37

Print publication date: 02/09/2017

Online publication date: 06/04/2017

Acceptance date: 01/04/2017

Date deposited: 25/04/2017

ISSN (print): 0098-1354

ISSN (electronic): 1873-4375

Publisher: Elsevier


DOI: 10.1016/j.compchemeng.2017.04.001


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